A woman uses a tablet to photograph shafts of light piercing the night sky at an installation entitled "Spectra" by Japanese artist Ryoji Ikeda outside the Houses of Parliament, London, Tuesday, Aug. 5, 2014. (AP Photo/David Azia)

A woman uses a tablet to photograph shafts of light piercing the night sky at an installation entitled "Spectra" by Japanese artist Ryoji Ikeda outside the Houses of Parliament, London, Tuesday, Aug. 5, 2014. (AP Photo/David Azia)

 Women from the Bari community laugh after performing a traditional dance during celebrations on the eve of South Sudan's declaration of independence in Juba, southern Sudan, Friday, July 8, 2011. (AP Photo/David Azia)

Women from the Bari community laugh after performing a traditional dance during celebrations on the eve of South Sudan's declaration of independence in Juba, southern Sudan, Friday, July 8, 2011. (AP Photo/David Azia)

 A steam locomotive makes its way inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

A steam locomotive makes its way inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

 Workers use steam to clear ice from a locomotive inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

Workers use steam to clear ice from a locomotive inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

 Steam locomotives operate in an open cast coal mine in Zhalainuer, Inner Mongolia, China, Tuesday, March 24, 2009.

Steam locomotives operate in an open cast coal mine in Zhalainuer, Inner Mongolia, China, Tuesday, March 24, 2009.

 India's Central Industrial Security Force soldiers wearing protective shoe covers, guard outside the Taj Mahal mausoleum in Agra, India, Monday, Oct. 18, 2010. Shoes are not allowed in the Taj Mahal, as they wear down the marble.

India's Central Industrial Security Force soldiers wearing protective shoe covers, guard outside the Taj Mahal mausoleum in Agra, India, Monday, Oct. 18, 2010. Shoes are not allowed in the Taj Mahal, as they wear down the marble.

 Alpenhorn players carry their instruments following a performance with 245 hornists as they walk along the Lac de Tracouet, situated 2200 meters (7220 feet) above sea level in Haute-Nendaz, canton of Valais, Switzerland, Sunday, July 26, 2015. (AP Photo/David Azia)

Alpenhorn players carry their instruments following a performance with 245 hornists as they walk along the Lac de Tracouet, situated 2200 meters (7220 feet) above sea level in Haute-Nendaz, canton of Valais, Switzerland, Sunday, July 26, 2015. (AP Photo/David Azia)

 The cast of a television film production entitled "Churchill's Secret" wear period costumes as they take a break from filming outside Shoreditch Town Hall, London, Sunday, June 21, 2015.

The cast of a television film production entitled "Churchill's Secret" wear period costumes as they take a break from filming outside Shoreditch Town Hall, London, Sunday, June 21, 2015.

 An auto-rickshaw drive smiles as he negotiates evening traffic during the Commonwealth Games in New Delhi, India, Wednesday, Oct. 6, 2010.

An auto-rickshaw drive smiles as he negotiates evening traffic during the Commonwealth Games in New Delhi, India, Wednesday, Oct. 6, 2010.

 Competitors round the track during an amateur competition at the Lee Valley Velodrome, London, Tuesday, Dec. 1, 2015.

Competitors round the track during an amateur competition at the Lee Valley Velodrome, London, Tuesday, Dec. 1, 2015.

 An elderly man feeds birds in Regents Park, London, Wednesday, Feb. 11, 2009. (AP Photo/David Azia)

An elderly man feeds birds in Regents Park, London, Wednesday, Feb. 11, 2009. (AP Photo/David Azia)

 Russian men make use of telephones in a shop offering cheap calling rates in Manzhouli, Inner Mongolia, China, Friday, March 20, 2009.

Russian men make use of telephones in a shop offering cheap calling rates in Manzhouli, Inner Mongolia, China, Friday, March 20, 2009.

 A woman calling for passengers on a bus smiles as she poses for a photograph in Manzhouli, Inner Mongolia, China, Saturday, March 21, 2009.

A woman calling for passengers on a bus smiles as she poses for a photograph in Manzhouli, Inner Mongolia, China, Saturday, March 21, 2009.

 A child has his picture taken by his father on Brighton Pier, Brighton, England, Monday, April 20, 2009. (AP Photo/David Azia)

A child has his picture taken by his father on Brighton Pier, Brighton, England, Monday, April 20, 2009. (AP Photo/David Azia)

 A woman participating in the Fallas, a traditional celebration held in commemoration of Saint Joseph, sits on the ground in Valencia, Spain, Thursday, March 18, 2010.

A woman participating in the Fallas, a traditional celebration held in commemoration of Saint Joseph, sits on the ground in Valencia, Spain, Thursday, March 18, 2010.

 A man walks along a beach in Essaouira, Morocco, Wednesday, March 14, 2007.

A man walks along a beach in Essaouira, Morocco, Wednesday, March 14, 2007.

 People gather around a food stall in Jemaa el Fna, Marrakesh, Morocco, Monday, March 12, 2007.

People gather around a food stall in Jemaa el Fna, Marrakesh, Morocco, Monday, March 12, 2007.

 Soccer fans blow their vuvuzelas in downtown Pretoria, South Africa, Wednesday, June 16, 2010. (AP Photo/David Azia)

Soccer fans blow their vuvuzelas in downtown Pretoria, South Africa, Wednesday, June 16, 2010. (AP Photo/David Azia)

 Pedestrians walk past recently opened office blocks near King's Cross railway station, London, Wednesday, Dec. 10, 2014. (AP Photo/David Azia)

Pedestrians walk past recently opened office blocks near King's Cross railway station, London, Wednesday, Dec. 10, 2014. (AP Photo/David Azia)

 Members of the Serpentine swimming club line up for the traditional Christmas day swimming race in Hyde Park's Serpentine Lake, London, Tuesday, Dec. 25, 2007.

Members of the Serpentine swimming club line up for the traditional Christmas day swimming race in Hyde Park's Serpentine Lake, London, Tuesday, Dec. 25, 2007.

 A woman uses a tablet to photograph shafts of light piercing the night sky at an installation entitled "Spectra" by Japanese artist Ryoji Ikeda outside the Houses of Parliament, London, Tuesday, Aug. 5, 2014. (AP Photo/David Azia)
 Women from the Bari community laugh after performing a traditional dance during celebrations on the eve of South Sudan's declaration of independence in Juba, southern Sudan, Friday, July 8, 2011. (AP Photo/David Azia)
 A steam locomotive makes its way inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.
 Workers use steam to clear ice from a locomotive inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.
 Steam locomotives operate in an open cast coal mine in Zhalainuer, Inner Mongolia, China, Tuesday, March 24, 2009.
 India's Central Industrial Security Force soldiers wearing protective shoe covers, guard outside the Taj Mahal mausoleum in Agra, India, Monday, Oct. 18, 2010. Shoes are not allowed in the Taj Mahal, as they wear down the marble.
 Alpenhorn players carry their instruments following a performance with 245 hornists as they walk along the Lac de Tracouet, situated 2200 meters (7220 feet) above sea level in Haute-Nendaz, canton of Valais, Switzerland, Sunday, July 26, 2015. (AP Photo/David Azia)
 The cast of a television film production entitled "Churchill's Secret" wear period costumes as they take a break from filming outside Shoreditch Town Hall, London, Sunday, June 21, 2015.
 An auto-rickshaw drive smiles as he negotiates evening traffic during the Commonwealth Games in New Delhi, India, Wednesday, Oct. 6, 2010.
 Competitors round the track during an amateur competition at the Lee Valley Velodrome, London, Tuesday, Dec. 1, 2015.
 An elderly man feeds birds in Regents Park, London, Wednesday, Feb. 11, 2009. (AP Photo/David Azia)
 Russian men make use of telephones in a shop offering cheap calling rates in Manzhouli, Inner Mongolia, China, Friday, March 20, 2009.
 A woman calling for passengers on a bus smiles as she poses for a photograph in Manzhouli, Inner Mongolia, China, Saturday, March 21, 2009.
 A child has his picture taken by his father on Brighton Pier, Brighton, England, Monday, April 20, 2009. (AP Photo/David Azia)
 A woman participating in the Fallas, a traditional celebration held in commemoration of Saint Joseph, sits on the ground in Valencia, Spain, Thursday, March 18, 2010.
 A man walks along a beach in Essaouira, Morocco, Wednesday, March 14, 2007.
 People gather around a food stall in Jemaa el Fna, Marrakesh, Morocco, Monday, March 12, 2007.
 Soccer fans blow their vuvuzelas in downtown Pretoria, South Africa, Wednesday, June 16, 2010. (AP Photo/David Azia)
 Pedestrians walk past recently opened office blocks near King's Cross railway station, London, Wednesday, Dec. 10, 2014. (AP Photo/David Azia)
 Members of the Serpentine swimming club line up for the traditional Christmas day swimming race in Hyde Park's Serpentine Lake, London, Tuesday, Dec. 25, 2007.

A woman uses a tablet to photograph shafts of light piercing the night sky at an installation entitled "Spectra" by Japanese artist Ryoji Ikeda outside the Houses of Parliament, London, Tuesday, Aug. 5, 2014. (AP Photo/David Azia)

Women from the Bari community laugh after performing a traditional dance during celebrations on the eve of South Sudan's declaration of independence in Juba, southern Sudan, Friday, July 8, 2011. (AP Photo/David Azia)

A steam locomotive makes its way inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

Workers use steam to clear ice from a locomotive inside the opencast coal mine in Zhalainuer, Inner Mongolia, China, Monday, March 23, 2009.

Steam locomotives operate in an open cast coal mine in Zhalainuer, Inner Mongolia, China, Tuesday, March 24, 2009.

India's Central Industrial Security Force soldiers wearing protective shoe covers, guard outside the Taj Mahal mausoleum in Agra, India, Monday, Oct. 18, 2010. Shoes are not allowed in the Taj Mahal, as they wear down the marble.

Alpenhorn players carry their instruments following a performance with 245 hornists as they walk along the Lac de Tracouet, situated 2200 meters (7220 feet) above sea level in Haute-Nendaz, canton of Valais, Switzerland, Sunday, July 26, 2015. (AP Photo/David Azia)

The cast of a television film production entitled "Churchill's Secret" wear period costumes as they take a break from filming outside Shoreditch Town Hall, London, Sunday, June 21, 2015.

An auto-rickshaw drive smiles as he negotiates evening traffic during the Commonwealth Games in New Delhi, India, Wednesday, Oct. 6, 2010.

Competitors round the track during an amateur competition at the Lee Valley Velodrome, London, Tuesday, Dec. 1, 2015.

An elderly man feeds birds in Regents Park, London, Wednesday, Feb. 11, 2009. (AP Photo/David Azia)

Russian men make use of telephones in a shop offering cheap calling rates in Manzhouli, Inner Mongolia, China, Friday, March 20, 2009.

A woman calling for passengers on a bus smiles as she poses for a photograph in Manzhouli, Inner Mongolia, China, Saturday, March 21, 2009.

A child has his picture taken by his father on Brighton Pier, Brighton, England, Monday, April 20, 2009. (AP Photo/David Azia)

A woman participating in the Fallas, a traditional celebration held in commemoration of Saint Joseph, sits on the ground in Valencia, Spain, Thursday, March 18, 2010.

A man walks along a beach in Essaouira, Morocco, Wednesday, March 14, 2007.

People gather around a food stall in Jemaa el Fna, Marrakesh, Morocco, Monday, March 12, 2007.

Soccer fans blow their vuvuzelas in downtown Pretoria, South Africa, Wednesday, June 16, 2010. (AP Photo/David Azia)

Pedestrians walk past recently opened office blocks near King's Cross railway station, London, Wednesday, Dec. 10, 2014. (AP Photo/David Azia)

Members of the Serpentine swimming club line up for the traditional Christmas day swimming race in Hyde Park's Serpentine Lake, London, Tuesday, Dec. 25, 2007.

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